Thin layer chromatography. Some laboratories also measure phosphatidyl glycerol or count lamellar bodies.
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L/S ratio > 2.0 indicates fetal lung maturity.
Assessment of foetal lung maturity.
See also Phosphatidyl glycerol and Lamellar bodies.
L/S ratio < 2.0 indicates an increased risk of RDS at delivery.
L/S ratio < 1.5 indicates a very high risk of developing RDS.
Babies of diabetic mothers can develop RDS with L/S ratios > 2.0.
Spillman T et al. Crit Rev Clin Lab Sci. 1989; 27: 341-389.